Implemented nested inline tag parsing;

Added unit tests for LongDescription.php;
Added the "src" folder as white listed for code coverage in the PHPUnit configuration;
Fixed the @covers annotation inside the CoversTagTest.php (isn't this ironic?).

phpunit.xml.dist

@@ -6,4 +6,9 @@
       <directory>./tests/</directory>
     </testsuite>
   </testsuites>
+  <filter>
+    <whitelist>
+        <directory suffix=".php">./src/</directory>
+    </whitelist>
+  </filter>
 </phpunit>